A pair of Kitsune brothers by the name of Synon and Gynon - black fur with white markings and white fur with black markings, respectively; thought they will often switch names on a whim for the sake of confusing SCP personnel for fun.

Though they are extremely clever, they are easily distracted and to contain them, they must be provided with numerous puzzles and mentally-stimulating games to keep them occupied and prevent them from getting bored and escaping containment (they can easily pass through any form of terrestrial matter). This is not as easy at it seems, as they have an uncanny ability to recognize complex patterns and, if the difficulty of the puzzles provided is too predictable or if the format in which they are presented is too consistent, they will find them far too easy and become bored, encouraging them to escape containment.

Synon and Gynon will then proceed to pull numerous jokes, pranks and even sabotage to entertain themselves wherever and whenever they find the opportunity. Though none of these pranks have been shown to betray any sort of malevolent intent (most are completely harmless), several of them have caused numerous incidents involving destruction of Foundation property and even the deaths of numerous personnel.

Pranks include:

Placing a fez hat on the head of SCP-173

Putting oven mitts onto the hands of SCP-049

The permanent disabling of a site's failsafe nuclear warheads

Teleporting various SCPs into chambers inappropriate to their containment procedures

Shapeshifting into Keter-class objects outside of containment to scare personnel

Triggering false fire, intruder and containment breach alarms

Consuming all available foodstuffs in the cafeteria of Site-15

Plugging SCP-079 into a broken server

Under no circumstances must they come into any contact with SCP-951 after [DATA EXPUNGED]

They seem like two wacky guise who are wacky and awesome and clever for no reason other than to be wacky and awesome and clever. This reeks of The Things Dr Bright Is Not Allowed To Do At The Foundation, one of my absolute least favorite articles on the site, with the added pointlessness of them being kitsune.

I was kind of afraid of that, though it is not for the sake of being wacky; it is that they have the attention span of a dwarf hamster and are therefore so prone to boredom that they need something to preoccupy them to keep them from fucking things up.

If they've caused so much damage, why aren't they kept under sedation? Furthermore, why aren't they kept somewhere far away from any other SCP object that they could wreck? And if it's because of their omnipotent abilities that they keep showing up to mess with the Foundation, why do they have something against the Foundation?

I'm not really getting a sense of the mythological kitsune here, either.

Yeah, this is reading more and more like the Twins from Superjail! The Twins work because everything is insane and over-the-top. You can do stuff that's insane and over-the-top here, but you have to justify the hell out of it either by having it be an interesting story or having incredible writing. It could be that your prose will be amazing, but the idea does not sound in the least bit interesting.

Plus, "they have weird insides" sounds like an excuse more than an organic (so to speak) development. If they're so outside human understanding, why in the heck did they take the form of two madcap and wacky brothers who just like to deal with puzzles that are expressed through human logic?

Why doesn't the Foundation just use dogs to contain them, or even get their hoshi no tama (or whatever Japanese-Welsh Kitsune call them) and use that to control them?

Weird biochemistry doesn't really work because we know that both species of fox endemic to Japan can be sedated as easily as any other canine and all foxes are kitsune according to folklore (kitsune just means fox).